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Review & Installation Video

Review & Install Video

Hey guys, Stephanie with AmericanMuscle.com here with this Mishimoto downpipe that's available for all 2015 and up EcoBoost Mustangs. The Mishimoto downpipe is going to be for the EcoBoost owners who are looking for a stainless steel downpipe to replace the restrictive factory downpipe. This is a catted downpipe that allows for a factory or factory-like catback setup.
The whole point of an aftermarket downpipe is to relieve some of the restriction around the turbo, because from factory it's pretty constricting. Opening up some of the air flow from the turbo can give some nice performance improvements. Basically when it comes to the turbo, if you're looking for performance, you're pretty much going to want air flow as unrestricted as possible so the turbo can spool quickly. The faster the turbo can spool, the more gains that you'll see.
Taking a closer look at this downpipe here, it's a full three inch 304 stainless steel mandrel bent pipe with an optional step down. To break that down some, stainless steel is always going to be nice for exhaust components. You won't have to worry about corrosion with the Mishimoto downpipe. The idea behind mandrel bending is to get smoother exhaust flow. Smoother exhaust flow means more power and better performance. The step down is optional, which is great. If you run the adaptor, it's going to reduce the three inch down to a two and a quarter inch which leaves the option of keeping a stock catback or running an aftermarket two and a quarter inch one. Or, you can pair the downpipe with a three inch catback now or even down the road some. That means you can pick up the downpipe for some performance gains without having to purchase a complete new catback while you're at it unless you want to. Then you have some room to grow and the ability to upgrade in stages.
A three inch downpipe is definitely going to be larger than the factory downpipe, which means that you are upgrading here. You're going to notice a difference when you compare the factory downpipe to this one here. This particular downpipe has a high flow cat, but if you're looking to get around that cat, Mishimoto does offer a downpipe that comes noncatted which is going to cost a little less than the catted version here which is typical to see in all exhausts. If you pick up the uncatted version of this downpipe then it's going to be even less restrictive than the catted version.
Like I said, this is a high flow cat which means that it is more free flowing than the factory cat is. Even though the main idea behind an aftermarket downpipe is to help give the turbo unhindered air flow, swapping out your factory downpipe is also going to give you more sound, too, especially if you're running the uncatted version. You'll hear a lot more turbo noise and get more of that turbo four cylinder sound.
Also, be sure to keep in mind that a computer tune will be required to run either the catted or the off road version of this downpipe, so it is going to be necessary to tune for this downpipe. Even if you are going with the catted version of any downpipe, it's always recommended to run a tune, especially if you want to be able to realize the full power potential behind upgrading your downpipe.
Another nice thing about this downpipe is that it actually has the 302 bungs. This gives you room for the two O2 sensors and then another spot for a wide band as well which is always going to be a good idea when you start playing around with custom tunes and additional boost. This is a two piece design that comes with a floating two bolt flange, a slip joint connector, and a V band flange. It doesn't get any nicer than a good old V band.
If you take a look here, you'll see that Mishimoto designed the downpipe to put the flex pipe in more of a horizontal position instead of a vertical one like some other brands do. What I've noticed with the downpipe offerings across all brands, at least at this point in time, is that generally speaking the higher end players like Kooks and CPE share the same ideas Mishimoto does here, while the less expensive options like BBK have the flex pipe vertically positioned. This is just a little food for thought. Pair that with the knowledge of the two three and it's firing order.
When we look at price, the catted Mishimoto downpipe is pretty much right in the middle of the pack. It costs between $500 and $550 which is less expensive than Kooks, Stainless Works and CPE, but a little bit higher price than BBK. The offroad version is about $100 less. There are more options as far as brands with offroad downpipes. Mishimoto is still right around the middle of the pack there, too.
When it comes to the install, luckily this isn't a bad one. You're probably looking at a few hours to get everything done. I'm going to call it a one out of three wrenches on the scale. This is obviously going to be easier to do on a lift, but of course you can get the job done using a jack and stands if you don't have access to one. You won't need anything out of the ordinary, just a few sockets, wrenches and a short extension.
You're going to be removing the front and rear O2s for the install and swapping them over to the new downpipe. I'd just unclip and leave them in the factory downpipe and switch them after you get the old pipe out. This way you won't be twisting wires and it'll make for a faster install. You're going to be reusing the gasket from the turbo outlet, so don't forget to make sure to grab the factory downpipe gasket before installing the new downpipe, since sometimes the gasket can stick to the turbo. The third bung comes plugged, so if you're going to use it just remove the plug and put in your wideband sensor. If you're not ready for this yet, then just make sure that the plug is tight before you install the pipe. It's going to be easier to install the pipe in sections starting with the first section with the O2 sensors. Then, move on to the second section and insert the adapter, if you're going to use it, and through your reband on.
The only other thing I'd say is to line the new downpipe up first before tightening everything down, but that's about it. So, only a few bolts and about two hours time for the install. Overall, the Mishimoto downpipe is a three inch stainless steel downpipe that can work with either a three inch catback or it can step down to work with a two and a quarter inch catback. You have a choice between either catted or noncatted depending on what you're looking for. Not only is this going to increase performance, but it's also going to open up some sound on the EcoBoost as well. You can check this out more online for yourself and see what you think. I'm Stephanie, and for all things Mustang keep it right here at AmericanMuscle.com.

More Power And Performance. Release all the hidden horse power and torque your Turbocharged 2.3L EcoBoost Mustang has to offer with a Mishimoto 3" Performance Catted Down Pipe. Mishitmoto has seen dyno proven power gains of 65 horse power and 108 foot pounds of torque at the rear wheels with a custom tune.

More Aggressive Sound. A Mishimoto Down Pipe not only helps improve power and performance of your S550 EcoBoost Mustang, but it also adds a much more aggressive exhaust note when compared to the factory down pipe.

Stainless Steel Construction. Manufactured from high quality 3" diameter 304 stainless steel tubing for superior strength and corrosion resistance, this Mishimoto Down Pipe features smooth mandrel bends throughout the entire piping to improve exhaust flow for more power and better performance.

High Flow Cat. Mishimoto includes a high flowing catalytic converter that features a 200 cell spun metallic core that is specifically engineered for maximum flow and surface area, perfect for force inducted applications such as the turbocharged EcoBoost Mustang.

Three O2 Bungs Built-in. Mishimoto designed their Down Pipe with three O2 bungs to accommodate the two stock O2 sensors as well as to give you the ability to easily add a wideband sensor if so desired.

Required Upgrade. For proper operation and maximum power potential this Down Pipe will require reprogramming the vehicles computer. AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

3" to 2.25" Adaptor Included. This Mishimoto Down Pipe can be installed onto an aftermarket 3" catback as well as the factory or an aftermarket 2.25" catback exhaust with the use of the included 3" to 2.25" step-down adapter. This adapter allows you to upgrade your EcoBoost Mustang in stages saving you money.

Application. This Mishimoto Catted Down Pipe is designed to fit both automatic and manual 2015-2019 EcoBoost Mustang models equipped with the turbocharged 2.3L in-line 4-cylinder engine.

Technical Note: This Mishimoto product is intended for off road use, and is not legal for use in emission restrictive states.

Yes, we would still recommend a tune with a catted downpipe. The catted downpipes feature a high flow cat which would be less restrictive than the factory and can cause the CEL to come on which is the reason we would still recommend a tune with these downpipes.

We would recommend taking it to a professional shop or a ford dealership to diagnose the issue that the car may be experiencing, there should be no reason why that down pipe would cause the vehicle to smoke.

This kit features the 3" to 2.25" step down adapter, so if the MBRP cat back features a 3" system (most of them do) then this will work with it. If you are looking at a particular MBRP cat-back, we would be more than happy to verify the fitment with this downpipe. Please feel free to reach out to us via email, chat or phone if you are looking at a specific cat-back by MBRP.

The Mishimoto Down Pipe will pair with the Borla ATAK Exhaust. However, it is not CARB Legal and will not pass emissions in California. It may also void your warranty, but we recommend double checking with the dealership to be sure.

It's nicely made but the dang thing didn't come with the bolts to bolt onto the turbo. Shop is currently trying to now make custom bolts because the ones on the turbo will not come off apparently. Had to leave my car at the shop and now wonder if I can trust that the connection will be right. Unfortunate but will see how it holds up. Would be so much easier with bolts being supplied to mount onto the turbo.

This product was manufactured beautifully. But due to ford OEM parts and bolts, your best bet is to try and get this part put in as soon as you can after you purchase the car. I've had my car for about two years now, and having to remove the bolts from the turbo flange broke in half and it was the biggest pain in the butt. I had to take it in to a shop where they spent almost all day to take off the bolts and old downpipes.. they had to basically weld this downpipe onto the turbo because of how the old bolts left the turbo bolted holes. after a little trial and error and exhaust leak fixes, it does what its intended to do. Just sucks when the check engine light comes on and I have to continuously remove it with my tuner (Tuners can no longer block the O2 sensor from coming on for having an aftermarket down pipe).
Overall, if done correctly, this delivers some serious power gains.

This catted downpipe is is just what my ecoboost mustang needed! I paired it with a KandN cai and a SCT tune with a custom tune from Unleashed Tuning. I definitely recommend this downpipe to anyone looking for more power!

I had a bit of trouble fitting the pipe into the turbo but that was more my own fault since I did the install myself on jack stands but the other than that the install was straight forward, the pipe looked good with not damage and good welds. Once all the bolts and nuts were secured, I put my Unleashed tune into the car and wow did the car feel different. I noticed more power and torque and with all my other mods, I could hear the turbo whistle and exhaust being loud and mean. The fitment was good and after putting over 5K miles on it since the install, it was still working like it should. I recommend this downpipe as a good way to unleash more power from the EcoBoost

I love the downpipe! The car sounds much deeper and paired with the MBRP race catback its loud and mean! An issue was some damage when I received the pipe and the lack of support from AM and Mishimoto. Had to get it repaired and then installed.

Went with the Mishimoto downpipe because of a lot of positive experience with their other products. Fit and finish top notch with everything machine perfectly. Exhaust note took on a deep rasp - not in a bad way either. No real exhaust note changes below 2500 rpm; over that and you hear it! Nice.
Here comes the rub. The mating point for the downpipe to the catbacks has a flanged end. You can either 1) run as Mishi pipe as designed and have your 3" pipe reduce down to the 2.25" joiner or 2) buy the Mishimoto exhaust adapter so you can run 3" all the way back for another $85. Mishi adapter "may" work with other catbacks but warnings it may not are plentiful.
I'm not bashing Mishi but that one proprietary flange put me in a position to have to drop another hundred to get 3" exhaust. Sort of like buying a car and being told afterwards the windshield wasn't included. Mishi quality is excellent but if I had it to do over, I would have gone with the Corsa or the Kooks downpipe.

I purchased this for my ecoboost, with an SCT tune. Brought out a really nice note with muffler deletes, and left resonator in place. HP is considerably greater. Giving the GT's a run for the money. Keep right up with the GT stock. Install took approximately 2 hrs.

Install took about 40 mins. Very easy if you have the right tools. I previously put the MBRP Race exhaust on and it had the bass but i wanted the aggressive sound with it. Started it up and wow right away i noticed the volume change and girthy explosive sound.

I researched this downpipe very thoroughly then decided to purchase it and have a muffler shop install it. Before this downpipe i had a jlt intake and unleashed tune on my 2016 ecoboost mustang. They woke up the car pretty good. After the downpipe installation and tunes from unleahed the car is a beast. It really pulls hard at bottom end and at highway speeds which it hits in a hurry, it opens up hard even at half throttle. This is a great product. It is almost as fast as my 2013 5.0 now.

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